Method and apparatus for processing the output signals of an opt

Details Method and apparatus for processing the output signals of an opt Method and apparatus for processing the output signals of an opt

1985-06-13

1987-08-04

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250342, 250347, 250351, G01J 134

Patent

active

046848045

ABSTRACT:
A method and an apparatus for processing the output signals of an optical rth-horizon sensor (1) operating in the infrared range of an orbiting, e.g. stationary earth satellite with respect to variously warm oppositely located earth rims (earth anomaly). With the earth-horizon sensor (1), an off-course signal is formed which is a measurement of the off-course angle of the line of sight of the earth-horizon sensor in relation to the satellite/earth central point connection line and is used for the attitude control of the earth satellite. This off-course signal is corrected in dependence on the earth anomaly. For a fine correcting of the off-course signal, the output signals of the earth horizon sensor which can be assigned to an earth rim with higher temperature, and those which can be assigned to the other oppositely located earth rim with lower temperature, are attenuated or amplified, respectively, in such a way, in dependence on a correction signal taking into account the earth anomaly, that the amplitude changes of the off-course signal caused by the earth anomaly are cancelled.

REFERENCES:
patent: 3486024 (1969-12-01), Astheimer
patent: 3551681 (1970-12-01), Astheimer
patent: 3714432 (1973-01-01), Jalink, Jr.
patent: 3920994 (1975-11-01), Cargille

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